Blow-off valve



spt.1o,19z9. f H.; @YER 1,728,017

BLOW-OFF VALVE Filed NOV- 7. 1924 ZZ 4 27 t f7 'f la y 15 if Y z 19 J6 Il\ j; 1a 10j; 11

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.ai I a Z7] l I I .i l fg' .9j L J0 j' f6 16 I J7 1a a la 12 l Y l @www J5 y a Patented Sept. 10, 1929.

UNITED STATES HARRY J. Moyen', or CHICAGO, ILLINOIS.

l BLOW-OFF e VALVE.

Appucaun ined November 7, 1921i.i serial No. '745,398.

My invention relates to valves with par*` tcular reference yto balanced and partially` balanced valves for use 'with veryyhigh pressures. A purpose of my invention is to provide a gland for the laterally apertured tubular u valve element with screw retaining means within the body of `the valve. i

A further` purpose is to provide for indeio pendent adjustments and tightenings of the upper and lower glands. f 4 n t A furtherpurpose isto preferablylmake rigid connection between the bonnet and valve .body `in a `seatless valve.

licationy and in the claims.

I havexselected for illustration only ltwo forms o-f my invention, the yforms Ytaken hows ever beingwof those that yare reliable and eiiicient in'operation, easyy and inexpensive to inanufactureand which'wellfillustrate the principles involved.

Figure 11 is` a vertical sectionofa struc,-v

turek embodying my invention.

Figure 2 isy avertical section partly in ele- `vation showing` a modifiedform. y y Similar numerals ind'cat like parts in both figures. n Describing in illustration and 'not inlimitation and referringto 'the drawings The tulmlarplug` elementl 6 laterally apertured at 7 lits the bore4 Sof `the'x'falve body l 9. The valve body iscountefrbored at 10 to provide an annular 'seat for packing`11and has inlet 12 on one side of the"7 plug-valve f element and outlet 13 on the othersidey therei of and surroundingit. Bonnet lll apertured y for'stem 15 closes the `top of the body.,k The operating means for the valve is not shown'y in Figure. 1.

`The gland through the projecting ears or flange 18 circumferentially vspaced around the gland. ,y

The plug is laterally flanged at 19` abovey the gland', engaging the uppermfacejof the gland inclosure, pressing the gland [down to compress and tighten the packing.

The stem 15 oftheplug element inthe Further purposes will appear inthe speciz or follower ring 16'for the pack-k ing 11 isheld to place by screwsl'? threaded'` into the valve body 9 and loosely passing' form sh'own'in Figure 1 pinned at2O withink the recess 21 in top of` the plug. n

If desired there may be loose connection between the'stem and plug element as illustrated in Figure 2. 'i

The body has internal diameter beneath they bonnet sufficiently large to pass the lower gland 16 and in the form of Figure 1 is boltedrigidly to the bonnet, a tight joint being secured by usual packing 22.

The bonnet." gland and the means yfor raising and lowering they stem, not completely shown in Figure 1,` may be 'ofany usual or special type.

rFhe valve ymay bebalanced partially orl Wholly.` "In yFigure 1I show the valve elethe'v sectional area of the plug. kIn this arrangement whenthe valve is closing there is an unbalanced force towardclosure, increasf ing any downward yforce exerted by turning the wheel. j This unbalanced pressurey is'.

" equ'alto the unbalanced area in k*square inches,'

saytimes the'pressure per square inch within ythe body. This unbalanced force is diey rectly eectiveto increasethe compression rof and. therefore .the tightness of the packing l1. lIt `is communicated throughwthe plugbymeans of rim or projection 19 pressn` yment but' partially balancedfthesectional y yarea ofthe stem being materially less ythan ing against the gland 16 to press this gland y yVhere the valve vis completely balancede rasin Figure 2, it is advantageous to have a longitudinally y'loose connection between the stemand. itsy plug.` As illustrated `this loose connection isy obtained by headed pin 23 and bushing 24vth`readed into the top vof the plug. Ther shank 25 ofk the pin passing through the bushing is fastened as by pin 26 inthe bottom of the stem member. Preferably the head ot the pin 23 has both longitudinal and ylateral play.

whole sectional area of the plug, and as the plug presses vat 19 `against the gland 16, this whole pressure becomes continuously eective to press the gland down` upon 'the' packing. Other advantageousdteatures ot this loose connection between the stem and plugmembersl include accommodation to any slight diderence ot alignment between the plug and stem' members and greater ease 1n starting the valve to open. The upward` ly-directed 'and downwardly-directed steam pressures are balanced. Until the lost motion has been ytaken upthe upward pressure en the stem is not balanced and wholly helpsv the starting.,` s l In Figure l the gland and packing around the stein member are o'r any usual type and steam-tight connectionis inade between the and bolts 27 connecting Vilanges 28 and 29.

\. Ihis construction is particularly desirable when ,the stem, member is considerably smaller sectionallyfthan the plug member, which isthe case in Figure l.V

When. the valveis nearlyk or completely,

. balanced by makingthestem member nearly fiasshown in Figure 2. I-Iere the upper endl; tree to furtherl compress the packing, a

of the body isl counterbored Vto" ,prov'i'de al as large orl as large as the,v plug member, the structure oi' the packing. `around the stem and the mountingfbetween bonnet and-body members may advantageously v*be modified shoulder 30 whichY seats aremovable ring support 3l torfthestem packing 32.Y The bonnet isprovided witha downward flange loosely litting` and 'closely VlillingKY the annularspa'ee around the'stem containing the packing 32. 'Ihis ilan'ge forms a packing follower ring and is pressed. into the .packing to any desired extent by means l of the'retaimngbolts'27 which loosely pass ,through ilange28 of the bonnet tol screw into flange 29 of the bo-dy. k

p fluid pressure withinrthe bodyojfthe. valve tends to tighten thev packing ll, and thatin both forms there is provision made" tor independent adgustments and tightemngs of the upper and lowerA glands, and that in both forms'the gland for the'plug element is provided with retainingV andV tightening In. view or" myfinvention and disclosure Vvariations'and modifications to ymeet individual whim or particular need may welloccur to others skilled in .the art, and I therefore claim all such variations and modifications in so tar as they tall within the It is obviousthatin both forms shown the yto tightenthe packing and permanent means for tightening the packing located within and engaging the gland and valve body.

2. In a high pressure valve, a valve body having ka 'lateral inlet and an outlet perpendicular to the inlet, a valve plug mov# able lengthwise of the outlet, operating means tor the plug of. smaller diameter within the bodythan the outlet, a gland and packing surrounding the plug, screw means` for tightening the gland against the packing located withinthe body and projection means upon the plug engaging the gland to transmit the valve operating pressure and the unbalanced fluidv pressure ,within the body and the bonnet through packing 22 valve body through the plug to the gland.

8. In a high pressure valve, a tubular plug permitting lateral access, ay gland thereabout,

a body surrounding the plug and gland and, ,in closed positions o t the valve, circumferjentiallyffitting the plug above 'the point of access,j packing ycircumterentially fitting the lplug andy located between the bottomv of `thegland andthe body, screws between the ,gland andbody adapted toLpress the gland initially -into the packing 'andto limit its upward' position while l'eavingthe gland y t. In 'a high pressure valve, a tubular plug permitting lateral access, a gland thereabout through which the plug is movable, packing under the gland'aroundthe plug, an abutment carried bythe plug adapted to engage the gland during' valve closure in order tomore firmly seat the gland upon its packing, abody surrounding the plug and gland and,-in closed positions of the valve, circumferentially fitting the plug abovether point ot access, and operating means for raising and lowering the plug, and other means within the body adapted to adjustably limit thefupwardk movement of the gland when raising the plug.l n

5. In a high pressure valve, a tubular plug permitting lateral access, a langeon the plug, a gland about the plugadapted tobeV 4engaged by the liange when the plug is in closed'pos'ition, a body surrounding the plug and gland andv in closed valve positions, circumterentially fitting the plug above the point of access, packing annularly fitting the plug and located between the bottom of the gland and the body, screws located outside of the circumference of the packing within the body and between the body and gland presenting at their heads downwardly abutting surfaces toward upwardly abutting surfaces of the gland for adjustably supporting the gland against upward movement during the raising of the plug and operating means for raising and lowering the plug.

6. In a high pressure valve, a tubular plug permitting lateral access, a ylongitudinally movable gland through which the plug is movable, packing around the plug under the gland adapt-ed to be tightened when the gland is depressed, the plug presenting a downwardly presented abutment adapted to engage during plug depression `an up'n wardly presented abutment of the gland in order to depress the gland in to the packing when the valve is closed, a body surrounding the plug andgland and circumferentially fitting the plug, screws outside of the packing passing through the gland and into the body, adjustably limiting the upward movement of the gland when raising ythe plug, and operating means for raising and lowering the plug.

- HARRY J. MoYER. 

